<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>画图</title>
		<style>
			.big{
				width: 200px;
				height: 200px;
				border: 1px solid black;
				border-radius: 100px;
				position: relative;
			}
			.left-half{
				width: 100px;
				height: 200px;
				border-bottom-left-radius: 100px;
				border-top-left-radius: 100px;
				background-color: black;
				float: left;
			}
			.right-half{
				width: 100px;
				height: 200px;
				border-bottom-right-radius: 100px;
				border-top-right-radius: 100px;
				background-color: white;
				float: left;
			}
			.top-mid{
				width: 100px;
				height: 100px;
				position: relative;
				top: 0px;
				left: 50px;
				border-radius: 50px;
				background-color: white;
			}
			.bottom-mid{
				width: 100px;
				height: 100px;
				position: relative;
				top: 0px;
				left: 50px;
				border-radius: 50px;
				background-color: black;
			}
			.top-small{
				width: 50px;
				height: 50px;
				position: relative;
				top: 25px;
				left: 25px;
				border-radius: 25px;
				background-color: black;
			}
			.bottom-small{
				width: 50px;
				height: 50px;
				position: relative;
				top: 25px;
				left: 25px;
				border-radius: 25px;
				background-color: white;
			}
		</style>
	</head>
	<body>
		<div class="big">
			<div class="left-half"></div>
			<div class="right-half"></div>
			<div class="top-mid">
				<div class="top-small">
				</div>
			</div>
			<div class="bottom-mid">
				<div class="bottom-small">
				</div>
			</div>
		</div>
		
	</body>
</html>
